.htaccess 进行https/http和有无www转向的设置方法

下面代码应该写在RewriteBase / 之后

强制https：

RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

强制http：

RewriteCond %{HTTPS} on
RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

无www转向至www：

# Redirect non-www to www   
RewriteCond %{HTTP_HOST} !^www\.(.*)   
RewriteRule (.*) http://www.%{HTTP_HOST}/$1 [R=301,L]

有www转向至无：

# Redirect www to non-www   
RewriteCond %{HTTP_HOST} ^www\.(.*)   
RewriteRule (.*) http://%1/$1 [R=301,L]